TL;DR if I a set up with eero 2nd gen and want to add a 4th node that's wifi6 will I notice any performance increase if I'm happy with my set up now.

Currently I have the eero 2nd gen wifi 5 set up. It covers my house well. My network setup is as follows in my 2500sq foot, 2 story house with basement. Cable modem+eero gateway on main floor. I use MoCA. Wired eero on other side of main floor using MoCA backhaul. Wireless eero on 2nd floor. In my basement i have a MoCA adapter+switch in my office room in the basement.

I want to add a new node to the basement since I want to move my cable modem down there. If I buy a new node does it matter if I get one of the newer eeros or the same model of what I have now? Will there be increased performance with wifi6 as the gateway node if others are wifi5 and this node is in the basement?